China, the world's largest miner, has closed many mines in recent years to reduce environmental damage.

作为世界上最大的稀土开采国，中国近年来关闭了许多矿场，以减少对环境的破坏。

Hundreds of men were thrown out of work when the mine closed down.

【throw】矿井关闭，数百人一下子都失去了工作。